An atheist is a person that doesn't believe in any god. Ergo not against any religion. (as long as it doesn't make people burn animals alive or something) Why would an atheist do something like this? I'm an atheist myself. I don't believe in angels so why would I go up in a rocket to kill them, or god, or jesus? Maybe there's a story behind it or something. Then make it clearer. Sorry if I seem like a sh** head, but I had to speak my mind.
Your flash was ok. There's some flaws like when the people on the cloud hit by the rocket. They move from one spot to another. You should check it out. And the sword-clashing sounds is a little late. Take some time to work this out and you have a good flash.
Thanks for reading:)